Question

Must be in C++ and we can not use STR[] we must use STR.at()

Write a program that:

1. Declares a variable suitable for holding a person’s name
2. Prompts the user to enter a person’s name with the text Enter name:
3. Reads the user's input and stores it in the variable created in step 1
4. Outputs the following information about the name they entered
   a. The index of the last character in the name
   b. The last 3 characters of the first name
   c. The first 3 characters of the last name
   Your output should look like the examples below. **Note: Your code should account for the fact that the user might enter a middle name or initial.

Example 1:

Enter name: Grace Hopper
Index of last character: 11
Last 3 characters of first name: ace
First 3 characters of last name: Hop

Example 2:

Enter name: Dorothy J. Vaughan
Index of last character: 17
Last 3 characters of first name: thy
First 3 characters of last name: Vau

This is my code:

#include <iostream>
#include <string>
using namespace std;

int main()
{
   string userFirstname;
   string userLastname;
   string userMiddlename;

   cout << "Enter Name: ";
   cin >> userFirstname;
   cin >> userMiddlename;
   cin >> userLastname;
   cout << userFirstname << userMiddlename << userLastname << endl;

   cout << "Index of last character: ";
   cout << ((userFirstname.size() + userLastname.size()) - 1);
   cout << endl;

   cout << "Last 3 characters of first name: ";
   cout << (userFirstname.at(userFirstname.size() - 3)) << (userFirstname.at(userFirstname.size() - 2)) << (userFirstname.at(userFirstname.size() - 1)) << endl;

   cout << "First 3 characters of last name: ";
   cout << userLastname.at(1) << userLastname.at(2) << userLastname.at(3) << endl;

   return 0;
}

Answer 1

// do comment if any problem arises

//there is some problem in your input method because middle name is optional so use getline()

#include <iostream>

#include <string>

using namespace std;

// this method finds first space that occured in given string

int first_space(string temp)

{

    for (int i = 0; i < temp.size(); i++)

    {

        if (temp.at(i) == ' ')

            return i;

    }

    return -1;

}

// this method finds last space that occured in given string

int last_space(string temp)

{

    int last = -1;

    for (int i = 0; i < temp.size(); i++)

    {

        if (temp.at(i) == ' ')

            last = i;

    }

    return last;

}

int main()

{

    string username;

    cout<<"Enter Name: ";

    getline(cin, username);

    cout << username << endl;

    cout << "Index of last character: ";

    cout << (username.size() - 1)<<endl;

    cout << "Last 3 characters of first name: ";

    // find ending index of first name

    int first=first_space(username);

    // find starting index of last name

    int last=last_space(username);

    cout << (username.at(first - 3)) << (username.at(first - 2)) << (username.at(first - 1)) << endl;

    cout << "First 3 characters of last name: ";

    cout << username.at(last+1) << username.at(last+2) << username.at(last+3) << endl;

    return 0;

}

Output: